Extension tower



C. SCHWARZ EXTENSION TOWER Wm. M, 1924. 151mm Filed June 23, 1922- 2Sheets-Sheet 2 IN VENTOR WIT/Masses Patented @ct. 1d, 192d.

CARL SCHWARZ, 035 PITTSBURGH, PENNSYLVANIA.

EXTENSION rowan.

Application filed June 23, 1922. Serial No. 570,441.

To all whom it may concern:

Be it known that I, CARL SoHwAnz, a citizen of the United States, and aresident of Pittsburgh, in the county of Allegheny and the State ofPennsylvania, have made a new and useful invention in Extension Towers,of which the following is a specification.

This invention relates to extension towers.

In the distribution of material. such as concrete in buildingoperations, it is now customary to erect towers of sufficient heightfrom the top of which to distribute the concrete throughout the entirebuilding operations. These towers are generally of more or less skeletonformation built from heavy timbers and when the building operation iscompleted, the lumber entering into the make-up of the towers ispractically lostor worthless. The construction of these timber towers isexpensive, both from the standpoint of the lumber used and the labornecessary to build the same.

An object of this invention is to provide a tower capable of being usedas the present towers are, (especially for concrete distribution) themajor part of which is a permanent structure, capable of being collapsedfor storage and transportation and of being extended to form the basisfor a rigid and practical structure, capable of fulfilling all, therequirements which such a tower has to meet.

This, as well as other objects which will readily appear to thoseskilled in this particular art, I attain by means of the devicedescribed in the specification and illustrat ed in the drawingsaccompanying and forming part of this application.

In the drawings, Figure 1 is a view in side elevation of a towerembodying this invention shown in extended or operative position. Figure2 is a view in sectional front or back elevation as the case may be ofthe upper portion of the tower shown in Fig. 1. Fig. 3 is a top planview taken on line 33 of Fig. 2. Fig. 4 is a view in side elevation ofthe tower shown in Fig. 1, collapsed with the elevator rails and tierods removed. Fig. 5 is a top view in section of the top of thestructure. Fig. 6 is a view partially in section and partially in plantaken on line'66 of Fig. 1, looking downwardly. Figs. 7 8, and 9 areenlarged detail views of portions of the apparatus.

The tower in a general way consists of four series of lazy tongs soarranged and articulated as to form a hollow square open work structurecapable of being manipulated from the base end thereof, 'soas to extendthe same to the desired height and to collapse the same for the purposeof storing the structure or transporting it. y

The structure is mounted upon'a base and when extended to the desiredheight, is guyed against side movement and then formed into a rigidnon-collapsing structure by means of horizontal tie rods and uprightvertical rails forming elevator guides.

Each series of lazy tongs is made up of crossed levers 10 (shown in Fig.9), each consisting of a bar-shaped body portion 11 having reinforcingribs 12 and 13. The ribs are spaced at the center of the bar so as toallow the crossed bars to be riveted together as shown at 13 and theends of the body portion are provided with holes or openings 14.

The co-operating series of lazy tongs forming the several sections ofthe structure are secured to corner brackets 15 illustrated in detail inFig. 8. The ends of the bars 10 are preferably riveted to the cornerbrackets by means of shouldered rivets so that the bars can freely pivotin the brackets. Each pair of levers 10 for one side of a horizontalsection of the structure are arranged so that the strengthening ribs 12and 13 of one lever lie on the inside of the structure while those ofthe other lever lie on the outside of the structure.

The lower ends of the lowermost pair of crossed levers are pivotallyconnected to collapsible sill members 1616 which in turn, rest on sills1717. 1 1

Two operating screws 1818 each provided on opposite sides of its centerwith oppositely arranged threads at its center is unthreaded and theunthreaded portion of each is mounted for rotation in a supportingbracket 19 carried on its sill 17. Screws 18 are threaded throughthreaded blocks 20 secured in the ends of sill members 16. The outer endof each screw 18 car? ries a worm wheel 21 and an operating shaft 22carrying an operating crank 23 at one end is provided with worms 2424which mesh with worm wheels 21. Shaft 22 is collapsible and theco-operating parts are preferably squared one externally and the otherinternally, so that both parts will operate in unison. and as one indriving worms 24:.

I Sill members which are collapsible, are fifefra-lili fortified showniii 7 i Which'is' a View taken on line 77 of Fig.

'6 looking in the direction of the arrows.

One half of each member consists of a nel section having a cover plateclosing its open side. 'VVithin this, a channel section 27 is fitted toslide. Channel 27 is provided With an end or abutment plate 28 andbetween t his andblock 20 two coil 2 9 ,30 ar'fconfi'lied can plate 2 is"provided with" an abutment end 31 7' ih s i fi i li b infi tech e 27and f rms 'one abutment for two eoil springs was 201 other the series ofsimilar to 3'0. opposite ends of. these springs abut against end sins i7are apporad on stationar .f oiindationsills s2. Assails 16 are moved av, All: "sills'l'l' will be cause to approach dne anii'ect sanietcgithefi and to sills this the tower iseollapsed by reverseinbveiiieiit oiserews 18; sil members 16' will be foi'ceid it b? thestress amt sills 1'? sin be for ifd empty the springs 29 as tion tosiues;

The four sex-1656f lazy tongsattli eir top I support the tower head andthe four iiieiiib'eie 3e inningup: this head can; ra ned iiislibs'tahtiauy the" sanie manner as one of th'siill members" 16'. Eachmember '33 at its eras-ran emf-16 a block at formed was an eye in; a guwas or cable. The block is; ans-la the end 'Of'tli channel reenter io'riiiin'g'fl ens enis-a or mem er-13s, by a rivet 36 which passs'thieugn the channel member; the block 8, and iiil ila plate 37 withwhich inner channel member "38 of mglabeg' s3 is rovi ed. y na amass,the iourmem'bersas are held in nit-psian: form a squarehavingcollapsible Aft'ei; themes-1* is xtended td the as} sired. height;horizontal "tfo'iiiie'etiljig Bars 39 I are hooked in place in holesformed for that purpose in brackets 15 and by ineans of turn-buckles 41these horizontal connecting bend ear; anotli'eif b." wa of screws ismembers are tightened up so as ,to stiffen the sesame The eievatbr raisn are next positioned and bolted iii place to the levers 10. The openingbetween stiffening ribs 12 and 13 on the inner levers 10 is of such len'th as to accommodate the elevator rails.

.55 springs confined within top members 33 are areferably of such lengththat they will no seated with their abutments when the tower iscollapsed, nor n1 has reached about Half of its enshe height.

If desired,- this m y alga e tite- Oi p'i'in s 29 nd 30 farming part asillinein are it.

An elevator or cage 43 is to slide within elevator guides 42 and 116operated iiieans of a suitable penis, 44 which passes overpulle'y's" 45and 46 carried "on caiheaa i7.

While i have de sest-ea tat ens eaten-t wotin wheel oii ea'ch rot and atelesco ing worm shaft fer driving said woilh wheels: p a

2.,111 an extensible tower, ij'bui series of interconnected ceoperaiirinz tongs fansing a rectangular eitensible str'uctiiie', a

ili i,l i aii ble tqivei liead seemed t6 Siiid ongs and means i'b'iraising a d lowering the structure.

11 ,an extensible power, multiple series of interconnected cooperating"laz'j' tongs forming a hollow extensible snwictui'e, k tlii eatle'olrods io'i spewing Said my t dllgy a warm, w en on teen rd and ail"ktnsildle woriii s liaft foi' driving said woi'lr'i wheels. V v Iiitestimony veer-ear, I have hereunto subscribed my naiii this 15th dayoi'line,

1922'. v i i I CARL senwlnz.

oi the invention as set

